CN1199768A - Apparatus for removal of particulate matter from gas streams - Google Patents

Apparatus for removal of particulate matter from gas streams Download PDF

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Publication number
CN1199768A
CN1199768A CN98105908A CN98105908A CN1199768A CN 1199768 A CN1199768 A CN 1199768A CN 98105908 A CN98105908 A CN 98105908A CN 98105908 A CN98105908 A CN 98105908A CN 1199768 A CN1199768 A CN 1199768A
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CN
China
Prior art keywords
mentioned
sieving equipment
equipment
sieving
terminal
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Granted
Application number
CN98105908A
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Chinese (zh)
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CN1091138C (en
Inventor
佩顿·L·史密斯
约翰·C·莫尔斯
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Destec Energy Inc
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Destec Energy Inc
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Publication of CN1199768A publication Critical patent/CN1199768A/en
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Publication of CN1091138C publication Critical patent/CN1091138C/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal

Abstract

The invention relates to an apparatus for the removal of particulate matter from the gaseous product stream of an entrained flow coal gasifier which apparatus includes an initial screen, an intermediate screen which is aligned with the direction of flow of the gaseous product stream and a final screen transversely disposed to the flow of gaseous product and which apparatus is capable of withstanding at least a pressure differential of about 10 psi (68.95 kPa) or greater at the temperatures of the gaseous product stream.

Description

From air-flow, remove the device of saccharoid
The present invention relates to from the air-flow that contains saccharoid to remove these saccharoids, more particularly, the present invention relates to remove by the soot particle contained in carbonaceous material gasification or the synthetic air that partial gasification produced and the carbon contg particle of transformation not.
Developed for example three kinds of basic skills of coal gasification of carbonaceous material already, i.e. (1) fixed bed gasification method, (2) fluidised form bed evaporating method, (3) suspend and carry evaporating method in other words secretly.The present invention relates to the third method, promptly suspend and carry evaporating method in other words secretly.
U.S. Patent No. 4872886 (Henly) disclosed implements to carry secretly gasification process to produce a kind of method of synthesis gas.In the method, the two-stage gasification reaction is arranged, at a kind of non-catalytic horizontal sintering slagging reaction zone in other words in the first step reactor, oxygen containing air-flow under the high temperature of 2400 (1316 ℃)-3000 (1649 ℃) with the liquid carrier that adds first in the phase reaction of granular carbonaceous solids slurry.Oxygen, carbonaceous solids and liquid carrier change steam, powdered carbon, bits and the combustion product of air-flow, liquid carrier into.The bits that form in reactor flow to the bottom of reactor by its gravity, and flow out the outside by slag notch.In second stage reaction, the contacting of granular carbonaceous solids slurry in the liquid vehicle that in the vertical second stage of a non-agglomerating reactor, adds from air-flow, liquid carrier steam, powdered carbon and the gaseous product of above-mentioned horizontal sintering reactor and produce air-flow, liquid carrier steam, synthesis gas and be clipped in powdered carbon in the air-flow with secondary.In addition, also be entrained with little viscous slag and drip, these slags drip easy adhesion and pollute the surface contact with them, and slag drips the solidified wider range, usually up to 1700 °F about (927 ℃).In the above-mentioned viscosity stage, these fusion slag particles slag in other words drip and have the viscosity that is enough to cause intractable because these slag particles in other words slag drip the wall, valve, outlet etc. of the processing unit that can adhere to the gasifier downstream part and form settling.Normally a kind of elevated temperature heat retrieving arrangement of the part of above-mentioned upstream device, boiler in other words, in the U.S. Patent No. 4872886 of above-mentioned Henly, the elevated temperature heat retrieving arrangement is a kind of tubular boiler.The synthesis gas product flow of polluting is crossed the pipeline of tubular boiler, and heat exchange fluid (normally water) is then in the housing side flow.Though use from the capital expenditure aspect tubular boiler economy many,, the shortcoming that the obstruction of pipeline but causes maintenance cost to improve.Because the coal slurry that infeeds is got very thin, so drip usually all can be by the pipeline of tubular boiler for any carbon granule and slag.But, the accumulation of these particles in the passage of gas reactor outlet pipe, originally be deposited on the channel of reactor wall and the sedimental broken of other breaker points places falls, and settling is in the covering and the accumulation of boiler ingress, the boiler mouth of pipe is narrowed down and increase and fall, finally block boiler tubing along the pressure of boiler systems.Therefore, be desirable to provide a kind of system and install in other words, this device wants to prevent that boiler from stopping up, and perhaps can postpone this obstruction at least, in other words, can experience the long as far as possible time pressure to be fallen increase before closing gasifier and cleaning boiler tubing.
Tried out various strainers already, but do not obtained satisfied result, and, perhaps, when part is stopped up, can not bear enough big pressure under the disruptive situation at itself and fall because strainer itself is plugged very soon.Have now found that, the combination of various filter sieve can make little carbon granule and slag particle not stop up by the pipeline of tubular boiler, simultaneously can prevent that again the bigger charcoal-slag accumulations or the declined settling that are blocked from entering in the pipeline of tubular boiler, and the synthesis gas that still allows to pollute is fallen by the combination sieve at suitable pressure.
Found that this favourable combination sieve can be applied to the coal gasification technical process of implementing satisfactorily under industrial condition, and one period suitable cycle of operation serially.Above-mentioned advantage and purpose with other will reach according to the present invention who the following describes.
The invention provides and a kind ofly be used for before air-flow enters heat exchanger removing wherein contained saccharoid in case the device (above-mentioned heat exchanger has the longitudinal axis that passes its leading section and tube sheet) that is silted up and stop up by these saccharoids, described device is combined by following several sieving equipments: near (a) terminal sieving equipment that is positioned at the above-mentioned tube sheet and sees to be in the tube sheet upstream along air flow line, this device contain the web material that is supported and central support part that is positioned at perpendicular to a plane of the longitudinal center line of above-mentioned heat exchanger; (b) central support that is bearing in above-mentioned terminal sieving equipment partly goes up and has a middle sieving equipment of circle tube member that at least one its longitudinal axis is parallel to the longitudinal center line of above-mentioned heat exchanger, this device contains the inner support with holes of a plurality of vertical settings and the inner support of a plurality of arranged transverselys, and these two kinds of inner support are formed the part that a plurality of outer periderm web material cover together; (c) one have the support element that the anchoring filament net materials uses and be arranged in the middle of the initial sieving equipment of upstream side of sieving equipment.The sieving equipment of aforesaid combination can bear up to 10 pounds/inch 2Pressure (68.9Kpa) falls, and the most handy alloy that contains nickel and chromium of above-mentioned mesh members is made.
Can easier explanation device of the present invention referring to accompanying drawing, in each accompanying drawing (not in scale), the part that the same numeral representative is identical.
Fig. 1 illustrates the present invention with the skeleton view of biopsy cavity marker devices, wherein is shown in dotted line the profile of several circle tube members of sieving equipment in the middle of forming.There is shown various supports and support, they are connected with some (not shown) on the wall of container, but they itself are not parts of the present invention.
Fig. 2 also is the skeleton view of biopsy cavity marker devices, shows the back side of device shown in Figure 1.Three circle tube members of sieving equipment in the middle of can more being clear that than Fig. 1.
Fig. 3 illustrates a part of the present invention, sees the middle sieve element of crossing in order to know, the initial sieving equipment that do not draw among the figure, this figure also are the skeleton views of a biopsy cavity marker devices.
The gasification of carbonaceous material (for example carrying method suspension method in other words secretly) has corrodibility by mobile in technological process pipeline and equipment and rodent air-flow forms a kind of high temperature and high pressure environment.The settling of bits, dust and powdered carbon covers on the internal surface of device, when these throw outs are broken fall and suspend or carry secretly other be mingled with solid matter the time, just can produce serious blockage problem.The elevated temperature heat recovery system is one may produce the field of stopping up and technological process being stopped fast.In one embodiment of the invention, the tubular boiler of the device that reclaims as elevated temperature heat prevents the coalescent of dust, powdered carbon and bits and sedimentally brokenly falls and pile up by a kind of device of removing various saccharoids contained in the gaseous effluent of carrying the streaming gasifier secretly.In general, tubular boiler be one can positioned vertical or placed horizontally and have the cylindrical vessel of a longitudinal axis, the additional tube sheet in its two ends is aimed at the pipeline of delivery industry waste gas.Heat-transfer fluid (preferably water) is transported in the housing side, is used for the heat in the industrial gaseous waste is sent out, and recovered steam.In order to prevent the line clogging of tubular boiler, before gas enters tubular boiler or any similar heat exchanger, used one group of sieving equipment.This sieving equipment group be preferably disposed on tube sheet near, and contain a terminal sieving equipment of seeing to be positioned at the heat exchanger front along air flow line, this device has the web material that is arranged on the support, and like this, its silk screen just can stop is enough to cause that the big particle of obstruction enters heat exchanger.Though this terminal sieving equipment can prevent the heat exchanger obstruction of tubular boiler etc. in other words,, if only use terminal sieving equipment itself, also can be very fast blocked, because its two dimensional structure can only be born about 3.5-4.0 pound/inch 2Pressure drop (24.1-27.6KPa).Therefore, terminal sieving equipment itself can not prevent to have the obstruction of the heat exchanger of any continuous working ability effectively.Above-mentioned terminal sieving equipment has the middle body of the middle sieving equipment of a supporting combination.
Middle sieving equipment is positioned at the upstream of terminal sieving equipment, and is bearing on the middle body of terminal sieving equipment.It can be any microscler member, and the terminal sieving equipment then is a plane institution movement.In other words, the general layout axis normal of middle sieving equipment is in the axis of terminal sieving equipment and conform to the longitudinal center line of heat exchanger usually.Be preferably, middle sieving equipment is that at least one has the bent member that is wrapped in its inner supporting structure on every side by web material.Be more preferably, the central support of terminal sieving equipment partly supports three bent members, and the longitudinal center line of these members is perpendicular to the plane of terminal sieving equipment and be parallel to the longitudinal center line of heat exchanger.Best is, middle sieving equipment is columnar and its longitudinal center line parallels perpendicular to terminal sieving equipment plane and with the longitudinal center line of heat exchanger, wherein, middle sieving equipment columnar structured has the lateral support member of the support section that a plurality of longitudinal supporting spares and a plurality of formation surrounded by web material.Because the longitudinal center line (perhaps above member axis) of middle sieving equipment is perpendicular to the plane of terminal sieving equipment, the gas of sieving equipment is difficult for being sealed, clogging or to block in the middle of flowing through, unless through predetermined, than only with the terminal sieving equipment after the longer time.Similarly, because gas flows along the axis direction of middle sieving equipment, and is difficult for stopping up, so that the pressure by middle sieving equipment falls is lower, middle sieving equipment can bear up to about 10 pounds/inch 2(68.9KPa) or higher (for example about 50 pounds/inch 2Be 344.74Kpa) pressure fall.
Initial sieving equipment in the front of middle sieving equipment in other words the upstream play the effect that other two sieving equipments of protection are not stopped up by bigger agglomerated thing or the broken settling that falls.The intensity of this initial sieving equipment claimed structure is higher, because it at first meets with the saccharoid of hot gas and largest block.An embodiment of initial sieving equipment contains the support element of anchoring filament net materials, this initial sieving equipment be preferably in cover the passage from gasifying reactor to the elevated temperature heat recovery system whole in the middle of sieving equipment.Effusive air-flow does not have bypass can walk around initial sieving equipment, and except flow through and enter the top of middle sieving equipment from the top of initial sieving equipment, still, this situation seldom took place before the serious obstruction of initial sieving equipment.
In a better implement example, initial sieving equipment is a kind of L shaped structure, and its top is in perpendicular in plane of terminal sieving equipment planar, and its underpart is in and is parallel in plane of terminal sieving equipment planar.
The structure of a most preferred embodiment as shown in Figure 1, device 10 of the present invention are positioned at for example top of tubular boiler (not shown) of a vertically disposed elevated temperature heat recovery system.Gaseous product stream by inlet pipe autopneumatolysis in the future reactor is directed to the top of tubular boiler shaft, and makes it to change 90 ° under the tubular boiler forward direction by equipment 10 of the present invention entering.
When gaseous product stream is passed through the top of heat regenerator, at first run into initial sieving equipment 28 with vertical component 12 and horizontal component 14, vertical component 12 has the rectangle support spare 32 of supporting web material 30 usually, and above-mentioned web material plays the effect of crossing cribellum of the particulate matter of removing in the gaseous product stream.The type of supporting structure (for example frame member 32) is a selection and problem easily generally speaking, it is generally acknowledged about the shape of frame member 32 not to be major issue.Frame member 32 also can be for example trilateral, circle, square etc. of other geometrical shapies.Just requirement can have initial sieve 28 by frame member 32 is enough to bear about 0.5 pound/inch 2Pressure (3.45KPa) falls and tolerates the impact intensity of force that is about the particulate matter in the 80 feet per second mobile gaseous product stream with flow velocity.The lower rim of the horizontal component 14 of the initial sieving equipment 28 in this most preferred embodiment is connected with vertical component 12, and constitutes a L shaped member with it.Horizontal component 14 also is made of frame member 32, and is consistent with the shape (implementing in this best is round shape) of the container that supports the elevated temperature heat recovery system usually.Therefore, circumferential is made in the neighboring of horizontal component 14.
Vertical component 12 and horizontal component 14 all are coated with web material 30.For example welding process or mechanical fasteners connection method are connected with horizontal component 14 with vertical component 12 web material 30 by any known method.The structured material of web material 30 can be anyly can bear the temperature of gaseous product flow and the metal of corrodibility and erosion environment condition, and for example all kinds of alloys are suitable for this purposes most.Usually, the alloy that contains nickel and chromium Inconel for example TM617 (w.va., the huntington is because of the commercial trade mark of international alloy company of section) is very suitable uses in corrosive environment.In addition, Incoloy TMThe alloy of series is Incoloy for example TM800HT has the ideal behavior that can be used for this type of atmosphere." Incoloy " also is the commercial trade mark because of international alloy company of section.In like manner, the web material 30 of above-mentioned initial sieving equipment 28 usefulness also can be used for other parts of the present invention.
Middle sieving equipment 16 be arranged on above-mentioned initial sieving equipment 28 near.Shown in Fig. 1,2 and 3 most preferred embodiment, middle sieving equipment 16 by three circle tube members in other words vertical tube form, each member is basic identical, still, if necessary also can be inequality.The web material 30 of sieving equipment 16 in the middle of the inner support 34 of vertical inner support 26 and level is used for supporting.Use a plurality of vertical inner support 26 around circle tube member, to give uniform supporting, see that on by columnar cross section it is as the spoke of a wheel.Each vertical inner support 26 is foraminous, so that allow gaseous product stream pass through, described hole will be large enough to make device 10 can not stop up, but also will be small enough to make vertical inner support to keep enough intensity to fall to bear above-mentioned pressure.In the middle sieving equipment 16 of the round shape of present embodiment, the annular that the shape of horizontal inner support 34 is preferably flat.The central opening of this annulus is as the passage of gaseous product stream, and the edge of annulus provides the stability of horizontal direction for vertical inner support 26.The entire structure of sieving equipment 16 had strength and stiffness in the middle of suitable being connected made respectively between horizontal inner support 34 and the vertical inner support 26.Fig. 3 illustrates the device of the present invention 10 that does not have initial sieving equipment 28, so sieving equipment 16 in the middle of can seeing clearly easilier.The circle tube member that covered by web material 30 top of vertical tube in other words also is shown among the figure.
Middle sieving equipment 16 is by the middle body supporting of terminal sieving equipment 18, and in this most preferred embodiment, terminal sieving equipment 18 is a kind of circular plate-like members that are coated with web material 30, but its middle body metal sheet normally.Terminal sieving equipment 18 is by 36 supportings of many support beams, these support beams 36 are not parts of the present invention, just be used for supporting device 10 on the whole, they are connected with vertical part 24 on wall of container that is fixed to heat exchanger or tubular boiler and/or the tube sheet (not shown) again.Horizontal support support 22 in other words is fixed on middle sieving equipment 16 and the wall of container by welding or mechanical fastener.One or more horizontal stable supports 20 that are fixed on initial sieving equipment 28 and the wall of container guarantee that initial sieving equipment remains on its preposition.In addition, make horizontal component 14 location with an a plurality of and vertical part 24 identical or different vertical parts 38 that prop up of initial screen cloth.
The hole that generally is square between the silk thread of web material 30, the size in hole is greater than about 0.625 inch (1.588cm), and preferably, the size of square mesh is approximately 0.625 inch (1.588cm)-0.75 inch (1.9cm) in the web material 30.
Though the device 10 design particulate matters that remove in the synthetic air of the present invention, but the size of mesh and heat-exchanger pipeline size all can not make less particle not flow through work system in the size of particulate matter (most importantly carbon granule) and the web material, also must they be removed and reclaim recirculation by other devices and enter gasifier.Adopt device of the present invention to be enough to make the production of synthesis gas to carry out several weeks and some months or longer time in an orderly manner.
In general, device 10 of the present invention must be made with the material of the temperature that can bear gaseous product stream (being about usually more than 1700 or 927 ℃).Pressure in the said system can be up to about 350 pounds/inch 2(2413.2KPa)-450 pound of/inch 2(3102.6KPa), so device 10 should bear about 10 pounds/inch 2Pressure difference (68.95KPa).
Though the non-restrictive example of at least one the best of the present invention has been described above,, the person skilled in the art it is contemplated that out many remodeling and replacement scheme, therefore, please the present invention is only limited to the legal range of stipulating in the following claim.

Claims (10)

1. one kind is used for removing the wherein contained device of saccharoid to prevent to be silted up and stop up by this particulate matter before air-flow enters heat exchanger, above-mentioned heat exchanger has the longitudinal axis that passes leading section and tube sheet, and described device is combined by following several sieving equipments:
A) near terminal sieving equipment that is positioned at the above-mentioned tube sheet and sees to be in the tube sheet upstream along air flow line, this device contain the web material that is supported and central support part that is positioned at perpendicular to a plane of the longitudinal axis of above-mentioned heat exchanger;
B) one is bearing in above-mentioned central support and partly goes up and have a middle sieving equipment of columnar structured that at least one its longitudinal axis is parallel to above-mentioned heat exchanger longitudinal center line, this device contains the inner support with holes of a plurality of vertical settings and the inner support of a plurality of arranged transverselys, and the above-mentioned inner support of above-mentioned middle sieving equipment is formed a plurality of parts that covered by web material together on every side; With
C) initial sieving equipment that has the support element of anchoring filament net materials and be arranged on the upstream side of middle sieving equipment.
2. according to the device of claim 1, it is characterized in that above-mentioned middle sieving equipment contains 3 circle tube members at least.
3. according to the device of claim 1, it is characterized in that the silk screen of above-mentioned terminal sieving equipment, above-mentioned middle sieving equipment and above-mentioned initial sieving equipment has the square cell of size greater than about 0.625 inch (1.588cm).
4. according to the device of claim 3, it is characterized in that above-mentioned square cell is foursquare, its size dimension scope is about 0.625 inch (1.588cm)-Yue 0.74 inch (1.9cm).
5. according to the device of claim 1, it is characterized in that above-mentioned silk screen is made by chromium-nickel alloy.
6. according to the device of claim 1, it is characterized in that this device can bear along about 10 pounds/inch of one side to the upstream of one side from the downstream of this device 2Pressure (68.95Kpa) falls.
7. according to the device of claim 1, it is characterized in that above-mentioned initial sieving equipment is positioned on the position of contiguous above-mentioned middle sieving equipment.
8. according to the device of claim 1, it is characterized in that above-mentioned initial sieving equipment has one and is in perpendicular to the top in plane of above-mentioned terminal sieving equipment planar and one and is in the lower section that is parallel in plane of above-mentioned terminal sieving equipment planar.
9. device according to Claim 8 is characterized in that, it is L shaped vertical component that above-mentioned initial sieving equipment is made L shaped, above-mentioned top, and above-mentioned lower section is L shaped horizontal component.
10. according to the device of claim 1, it is characterized in that above-mentioned terminal sieving equipment, above-mentioned middle sieving equipment and above-mentioned initial sieving equipment link together.
CN98105908A 1997-03-31 1998-03-30 Apparatus for removal of particulate matter from gas streams Expired - Lifetime CN1091138C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/823,035 US6027540A (en) 1997-03-31 1997-03-31 Apparatus for removal of particulate matter from gas streams
US823035 1997-03-31
US823,035 1997-03-31

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CN1199768A true CN1199768A (en) 1998-11-25
CN1091138C CN1091138C (en) 2002-09-18

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CN98105908A Expired - Lifetime CN1091138C (en) 1997-03-31 1998-03-30 Apparatus for removal of particulate matter from gas streams

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US (1) US6027540A (en)
EP (1) EP0869162B1 (en)
JP (1) JP2984647B2 (en)
KR (1) KR100492046B1 (en)
CN (1) CN1091138C (en)
AU (1) AU721350B2 (en)
CA (1) CA2233581C (en)
DE (1) DE69828100T2 (en)
ES (1) ES2235290T3 (en)
ZA (1) ZA982520B (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN106029598A (en) * 2014-02-25 2016-10-12 霍尔辛姆科技有限公司 Device for pre-heating cement raw meal for cement clinker production

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US6027540A (en) * 1997-03-31 2000-02-22 Destec Energy, Inc. Apparatus for removal of particulate matter from gas streams
FR2869424B1 (en) 2004-04-21 2006-06-23 Bosch Gmbh Robert CONTROL MEMBER FOR A MOTOR VEHICLE, BRAKE CONTROL SUITABLE FOR COOPERATING WITH THE SAME, AND METHOD FOR MOUNTING SUCH A BRAKE CONTROL
US7993131B2 (en) * 2007-08-28 2011-08-09 Conocophillips Company Burner nozzle
US7883682B2 (en) 2009-02-20 2011-02-08 Conocophillips Company Carbon dioxide rich off-gas from a two stage gasification process
ES2424689T3 (en) * 2009-04-29 2013-10-07 Styrolution GmbH Tubular beam heat exchanger and procedure for the separation of volatile substances from a polymer solution
US9428702B2 (en) 2011-07-12 2016-08-30 Gas Technology Institute Agglomerator with ceramic matrix composite obstacles
CN112742148B (en) * 2020-12-28 2022-10-11 中食安泓(广东)健康产业有限公司 Dust removal device and method for production and processing of anti-aging health care product and production method of health care product
KR102601808B1 (en) * 2021-12-27 2023-11-14 권수길 continuous operation equation pyrolysis emulsifier

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Publication number Priority date Publication date Assignee Title
CN106029598A (en) * 2014-02-25 2016-10-12 霍尔辛姆科技有限公司 Device for pre-heating cement raw meal for cement clinker production

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EP0869162A3 (en) 1999-04-28
CA2233581C (en) 2006-09-12
JP2984647B2 (en) 1999-11-29
KR100492046B1 (en) 2005-08-31
DE69828100T2 (en) 2005-09-01
ZA982520B (en) 1998-09-30
CN1091138C (en) 2002-09-18
JPH1170309A (en) 1999-03-16
DE69828100D1 (en) 2005-01-20
KR19980080836A (en) 1998-11-25
AU721350B2 (en) 2000-06-29
EP0869162A2 (en) 1998-10-07
CA2233581A1 (en) 1998-09-30
AU6057198A (en) 1998-10-01
ES2235290T3 (en) 2005-07-01
US6027540A (en) 2000-02-22
EP0869162B1 (en) 2004-12-15

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Granted publication date: 20020918